Circuit Testers | McMaster-Carr

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204 Products

Measuring and Inspecting

Electrical Outlet Testers

Electrical Outlet Testers

Confirm proper wiring by checking for open circuits

Voltage Detectors

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

Current Detectors

Current Detectors

Check for AC current and voltage without making direct contact with wire

Line Break Detectors

Line Break Detectors

Check for continuity in circuits

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

Test Lead Tips

Adapt Fluke test leads to perform electrical tests in tight spaces

Circuit Tracers

Circuit Tracers

Locate cables behind walls, check for continuity, and identify circuit breakers

Circuit Breaker Identifiers

Circuit Breaker Identifiers

Determine which circuit breaker is connected to an electrical receptacle

Multimeters

Take current, voltage, resistance, and other electrical measurements

Data Cable Identifiers

Data Cable Identifiers

Trace unshielded data and telephone cables to their source

Electronic-Component Testers

Electronic-Component Testers

Test, identify, and troubleshoot components such as circuit boards and diodes

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

Electrical

Binding Posts

Test circuits before making permanent connections

Electrical Cord Circuit Interrupter Converters

Electrical Cord Circuit Interrupter Converters

Hardwire to extension cords to protect against electric shock in wet areas

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)